Originat Cycte Start Date: Expiry Date of Previous Cycle: Certification/Recertification Audit Date: Certification/Recertification Cycte Start Date: Subject to the continued satisfactory operation of the organization's Management System, this certificate expires on: Certificate No: N1027324 I Version: 1 02 December 2003 14 Septembe r 2O24 16 February 2024 06 March 2024 18 March 2027 Revision date: 06 March 2024 Ow^ An\qgKerbusch - Director Certification Benelux Managing Office: Bureau Veritas lnspection and Certification The Netherlands B.V. - Ptotterweg 38, 3821 BB nmersfoort lssuing Office: Bureau Veritas lnspection and Certification The Nethertands B.V. - Plotterweg 38, 3821 BB Amersfoort Further clarifications regarding the scope of this certificate and the appticabitity of the management system requirements may be obtained by consutting the organization. Standard ISO 900 1:2015 Scope of suppty Version: 1 Revision date: 06 March 2024 Kerbusch - Director Certification Benelux Managing office: Bureau veritas lnspecLion and certification The Nethertan

Microsoft Word - EHS Committee Charter (Amended July 2022).doc AVIENT CORPORATION ENVIRONMENTAL, HEALTH AND SAFETY COMMITTEE CHARTER Membership • Members of the Environmental, Health and Safety Committee (the “Committee”) of the Board of Directors (the “Board”) of Avient Corporation (the “Company”) will be appointed by the Board each year. • Each Committee member will serve at the pleasure of the Board for such term as the Board may decide. Each Committee member will serve until his or her successor is elected and qualified, or until his or her earlier death, retirement, resignation, or removal by the Board. • The Committee will consist of a minimum of three directors.

The Chamber of Commerce recommends that this document be viewed in digital form so that its integrity is safeguarded and the signature remains verifiable. 20 21 -0 4- 12 1 4: 06 :2 8 under number CHE-112.279.714 Sole shareholder since 20-10-2015 (registration date: 03-11-2015) Board members Name Borst, Rainer Erich Date of birth 10-10-1961 Date of entry into office 01-07-2020 (registration date: 06-07-2020) Title Director Powers Solely/independently authorised Name Kamalak, Ihsan Date of birth 21-08-1985 Date of entry into office 01-07-2020 (registration date: 06-07-2020) Title Director Powers Solely/independently authorised Name Merklein, Norbert Date of birth 03-05-1964 Date of entry into office 05-03-2021 (registration date: 30-03-2021) Powers Solely/independently authorised Extract was made on 12-04-2021 at 14.06 hours.

Certificate of Amendment Loi canadienne sur les sociétés par actionsCanada Business Corporations Act Certificat de modification Avient Colorants Canada Inc. 942266-8 Corporate name / Dénomination sociale Corporation number / Numéro de société Raymond Edwards Date of amendment (YYYY-MM-DD) Date de modification (AAAA-MM-JJ) Director / Directeur 2021-01-15 I HEREBY CERTIFY that the articles of the above-named corporation are amended under section 178 of the Canada Business Corporations Act as set out in the attached articles of amendment. James Original signed by / Original signé par 4 Declaration: I certify that I am a director or an officer of the corporation.

Swanson, Director, Investor Relations, PolyOne Corporation, +1 440-930-1018, eric.swanson@avient.com, Media Contact: Kyle G.

Swanson, Director, Investor Relations, PolyOne Corporation, +1 440-930-1018, eric.swanson@avient.com, Media Contact: Kyle G.

Swanson, Director, Investor Relations, PolyOne Corporation, +1 440-930-1018, eric.swanson@avient.com; Media Contact: Kyle G.

Swanson, Director, Investor Relations, PolyOne Corporation, +1 440-930-1018, eric.swanson@avient.com; Media Contact: Kyle G.

Swanson Director, Investor Relations PolyOne Corporation +1 440-930-1018 eric.swanson@avient.com

Customers rely on PolyOne for the latest in material technology and technical expertise,” said James Mattey, marketing director, Performance Products & Solutions at PolyOne.